docs: fix LXC host address 192.168.0.108 -> 192.168.0.99

Revert of A9 address change. The .108 value was inferred from the
container VMID (108), not from its actual network config: net0 is
ip=dhcp and the container currently holds 192.168.0.99. Requests to
.108 fail with "No route to host", making the UI look down while all
four compose services are healthy.

A9 section in vector_tasks.md is kept as history and flagged stale so
the .99 -> .108 replacement is not repeated.

Note: the address is DHCP-assigned and may change again; a static IP
would be needed to make these docs durable. Hardcoded .99 URLs remain
in MobileForm.jsx:49 and HeatmapView.jsx:73 (tracked in vector_tasks.md,
untouched here).

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

FRONTEND_README.md

@@ -45,10 +45,10 @@
 
 ## Доступ
 
-- Десктоп: http://192.168.0.108:3000/admin
-- Мобильная форма: http://192.168.0.108:3000/mobile
-- API Backend: http://192.168.0.108:8000
-- Adminer: http://192.168.0.108:8080
+- Десктоп: http://192.168.0.99:3000/admin
+- Мобильная форма: http://192.168.0.99:3000/mobile
+- API Backend: http://192.168.0.99:8000
+- Adminer: http://192.168.0.99:8080
 
 ## Responsive дизайн